Highest temperature in Wellington on August 10?

Platform comparison

Market context

Wellington’s top temperature on 10 August will hinge on a fairly narrow winter range: the city’s August climatology is cool and stable, with average highs around 12–13°C and average lows near 8–9°C in the historical datasets.[5][9][18] For this market, the key operational detail is that settlement uses Weather Underground’s **Daily Observations** table at Wellington Intl Airport, so a programmatic approach should query the hourly observation feed rather than rely on the summary “Day High & Low” figure, then map the maximum Celsius reading into the market’s resolution band.[13]

Historical context also argues against extreme outcomes. Recent August histories for Wellington show daily maxima commonly in the low teens Celsius, with many days landing at 10–14°C and only modest variation year to year.[1][5][16] That means a 0% YES price is consistent with a market that currently sees the event as near-certain to fall below any higher temperature buckets, but a bot or conditional order strategy still needs to watch for a late-morning or early-afternoon spike that can change the day’s max even if the broader weather feels unsettled.[2][13]

The main catalysts are the intraday forecast path, cloud breaks, wind shifts, and any updated terminal observations from Wellington Intl Airport, because a small change in solar exposure can move the day’s peak by a degree or two in this season.[2][12][17] Traders automating this market would typically poll the Weather Underground history page through the settlement window, compare the live observation stream with the target Celsius bands, and avoid using forecast highs as a proxy, since the market resolves only on the recorded maximum in the observation table.[13]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

UK Frequently Asked Questions

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Bot UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.